\begin{tikzpicture}
    \tkzDefPoints{0/0/B,  2.5/0/C, 3.3/1.5/D, 0.8/1.5/A}
    \tkzDrawPolygon(A,B,C,D)
    \tkzLabelPoints[left](A,B)
    \tkzLabelPoints[right](C,D)
\end{tikzpicture}

